Submittal Sheet
87
V
ENTS
Vents
Model 3 Part No. 401419
Steam Air Line Valve
• Thermostatic vent (no float)
• For Air Line or Paul Systems
• Inlet
1
⁄8" NPT, outlet
1
⁄4" NPT
• Maximum operating pressure 25 psig (1.7 bar)* to vacuum
• Maximum pressure 25 psig (1.7 bar)
Model 4 Part No. 401416
Quick Valve
• Thermostatic air vent
• For steam systems and process equipment
• Operates on temperature change only;
does not close against water
• Must be installed 6-10" (150-250mm) above horizontal
return and 18" (450mm) above the boiler water line
•
1
⁄2" NPT female and
3
⁄4" NPT male straight shank
• Maximum operating pressure 25 psig (1.7 bar)*
• Maximum pressure 25 psig (1.7 bar)
To prevent steam vents from sputtering water or damage
from water hammer, observe the minumum elevations
shown.
Model 74 Part No. 401428
Steam Unit Heater Air Valve
• Float-type thermostatic vent
• Single non-adjustable port
•
1
⁄2" NPT female and
3
⁄4" NPT male straight shank
• Install 6-10" (150-250mm) above horizontal return
and 18" (450mm) above the boiler water line
• Maximum operating pressure 35 psig (2.4 bar)*
• Maximum pressure 35 psig (2.4 bar)
Special Steam Vents
Steam Unit Heater
Air Valve
Model 74
Steam Air Line Valve
Model 3
2
"
(51mm)
1
"
(25mm)
Inlet
Outlet
6
1
/8
"
(156mm)
2
1
/2
"
(64mm)
1
1
/2
"
(38mm)
2
5
/8
"
(67mm)
Air
Valve
Unit Heater
Install to Top
of Unit Heater
Sediment Pocket
18
"
(450mm) Minimum
15
"
(380mm)
Minimum
Boiler Water
Line
Wet Return
Dry Return
In 2-Pipe
Or
Supply Main
In 1-Pipe
Nipple 6-10" (150 to 250mm)
Main Steam Vent Air Valve
Nipple
3
/4
"
NPT
Coupling
3
/4
"
NPT
Reducer
Quick Valve
Model 4
Installation
Installation
*Drop away pressure (maximum pressure against which the vent
can open).
Model 74
Model 4